Maryland Biological Stream Survey

The Maryland Biological Stream Survey (MBSS) was started by the Maryland Department of Natural Resources in 1993 as a small pilot study in three watersheds. A second, larger demonstration project, expanded statewide, was conducted in 1994. The MBSS was Maryland's first probability-based or random design stream sampling program intended to provide unbiased estimates of stream conditions with known precision at various spatial scales ranging from large 6-digit river basins and medium-sized 8-digit watersheds to the entire state. The basis of the MBSS design is lattice or multi-stratification sampling that ensures all 1st through 3rd order (now 1st through 4th order), non-tidal streams in the sampling frame have a non-zero and known probability of being sampled. A stratified random design is a cost-effective way to characterize Maryland's 15,000+ miles of freshwater streams.

Status

Special project sampling was done in 2005-2006, to address issues uncovered in the first two rounds, along with planning for Round Three random sampling (2007-2009).We also examined our data with respect to species of interest to other groups within the Maryland DNR. Publications with the latest results are posted on the "What's New?" page.

Maps

The maps below indicate the watersheds we will be sampling in Round Three. Click on the image to download a print-quality 700KB pdf file of each map.

Reports and Publications

The most recent MBSS related publications are listed on the "What's New?" page. All other MBSS related publications that are available online can be found from this list of MBSS publications.

Training

• For MBSS protocols and procedures, contact Scott Stranko via e-mail or voice mail 410-260-8603.
• For Stream Waders, use the Stream Waders Volunteer link (in the right-hand table) to get the latest information. Details for the next Stream Waders training will be available on page: Stream Waders - What's New in January.